/* 公共样式 */


* {
    margin:0;
    padding:0;
    box-sizing: border-box;
}

html,body{
    height:100%;
    background-image: url(../image/99765590_p0.jpg);
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
} 

.nav {
    height: 50px;
    background-color: rgb(50,50,50);
    color: white;
    line-height: 50px;
    padding-left: 20px;
}
.container {
    height: calc(100% - 50px);

    display: flex;
    justify-content: center;
    align-items: center;
}